Ozone layer recovery on track

THE ozone layer that shields life on Earth from deadly solar radiation is on track to recover within decades, but controversial geoengineering schemes to blunt global warming could reverse that progress, a major scientific assessment warned Monday (Tuesday in Manila).

Since the mid-1970s, certain industrial aerosols have led to the depletion of ozone in the stratosphere, 11 to 40 kilometers (7 to 25 miles) above Earth's surface.